Make flake self-contained - consolidate installer-replication

BREAKING CHANGE: Remove external dots-hyprland dependency

- Imported all essential configs from dots-hyprland/installer-replication
- Added complete configs/ directory with:
  - hypr/ - Hyprland configuration
  - quickshell/ - Quickshell widgets and config
  - applications/ - Application configurations
  - scripts/ - Utility scripts
  - matugen/ - Material You theming
- Updated flake.nix to use local ./configs instead of external repo
- Simplified update-flake script (removed external repo management)
- Updated README to reflect self-contained architecture
- All builds pass with local configurations

Benefits:
- No external repository dependencies
- Faster builds (no network dependencies)
- Version controlled configs in single repo
- Easier maintenance and development
- Complete installer replication in one place

configs/quickshell/modules/common/widgets/CustomIcon.qml

@@ -0,0 +1,37 @@
+import QtQuick
+import Quickshell
+import Quickshell.Widgets
+import Qt5Compat.GraphicalEffects
+
+Item {
+    id: root
+    
+    property bool colorize: false
+    property color color
+    property string source: ""
+    property string iconFolder: Qt.resolvedUrl(Quickshell.shellPath("assets/icons"))  // The folder to check first
+    width: 30
+    height: 30
+    
+    IconImage {
+        id: iconImage
+        anchors.fill: parent
+        source: {
+            const fullPathWhenSourceIsIconName = iconFolder + "/" + root.source;
+            if (iconFolder && fullPathWhenSourceIsIconName) {
+                return fullPathWhenSourceIsIconName
+            }
+            return root.source
+        }
+        implicitSize: root.height
+    }
+
+    Loader {
+        active: root.colorize
+        anchors.fill: iconImage
+        sourceComponent: ColorOverlay {
+            source: iconImage
+            color: root.color
+        }
+    }
+}